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To solve the problem caused by the heavily axial gravity load of the rotor and main shaft of the hydraulic generators, a superconducting induction magnetic levitation device is proposed for hydraulic generator system. AC superconducting windings are implemented to increase the levitation force. The basic structure and principle are introduced. According to the calculated magnetic field distribution,...
A novel double side tubular permanent magnet linear machine was proposed. In the machine, the permanent magnet reciprocated axially between two slotless stators made up by core and windings. The double side slotless construction not only eliminates the cogging force, but also can provide higher force density than the normal tubular machines. By using 2D finite element analysis, the performances of...
The permanent magnet linear synchronous motor (PMLSM) with fractional slot per pole is widely applied in high speed digital machine tool and processing equipment of semiconductor due to many advantages such as short end of winding, low copper loss, high thrust force density and so on. Since the force performance closely depends on the structure, the different structures are investigated in detail...
The replacement of steam catapults with electromagnetic ones is becoming an overwhelming trend in aircraft launch systems. Recently, the double-sided linear launcher has attracted more and more attention from researchers. This paper presents the design and analysis of the moving-magnet-type permanent-magnet linear synchronous motor (PMLSM). The thrust density is the most important indicator for a...
The end effects are the particular sensitive difficulty to model linear drives. Moreover an electrical machine model which only considers single physical aspect is not sufficiently accurate. In this paper, 3D magnetic and thermal models are achieved taking into account the end effects and the multi-physical aspects. For the first step, the linear motor is studied as a braking system with different...
This paper presents a new decoupling method of the radial forces in a dual rotor-type magnetic suspension motor. The dual rotor-type magnetic suspension motor has been proposed by the author, and the motor structure and the principle of the suspension force generation have been introduced. However, it is possible that the mutual interference between the radial suspension forces in two perpendicular...
Vibration and noise reduction is one of the most important requirements in the design of PMSM due to its direct impact on service life and operating stability. The radial electromagnetic force acted on the rotor is a major factor of a PMSM influencing on its vibration and noise. In this paper, the distribution characteristics of radial electromagnetic force were theoretically analyzed on the basis...
In HTS transformer the ampere-turn distribution of the windings is usually made lower density than in the conventional transformer for decreasing the magnetic field. Moreover, in our study the secondary winding, different from the primary which is pancake, is chosen helical for cutting down the circulating current among the branches. So there is a difference of magnetomotive force at the same height...
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